Gas monitoring device



FIG. 1 is a front perspective view of a gas monitoring device;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a top view thereof.

The broken lines shown in the figures show portions of a gas monitoringdevice that form no part of the claimed design.

CLAIM The ornamental design for a gas monitoring device, as shown anddescribed.